Update trakt-java to 2.0.1 release.
Add skipped property to backup tool.

- Convert episode flag into separate watched and skipped boolean
properties (to not break existing format and ensure human readability).
Use EpisodeFlag in sync adapter db updates.

- Also collapse catch into multi-catch.
Add skipability to episode details.
Implement isValidFragment for PreferenceActivity. Ref #333.
Merge branch 'beta' into skip-episodes
Hide skip button in episode details instead of disabling it.

- Also add cheat sheet for checkin button.